Harish-Chandra Theorem for the Multi-Parameter Quantum Groups of Okado-Yamane Type

This paper studies the centre of quantum groups $U_{q,G}(\mathfrak{g})$, a class of multi-parameter quantum groups introduced by Okado and Yamane, where $\mathfrak{g}$ is a complex semisimple Lie algebra, and $G=(q_{ij})$ is a parameter matrix. We mainly establish the Harish-Chandra theorem, proving that the Harish-Chandra homomorphism is an isomorphism for all types.